Stocks fell Tuesday, ending three sessions of broad-based gains, following weak earnings reports from market heavyweights IBM (IBM) and United Technologies (UTX). The Dow Jones industrial average dropped 1.0% as United Technologies and IBM lost 7% and 6%, respectively. The S&P 500 fell 0.4% and the Nasdaq slipped 0.2%. Volume was mixed, up 5% on the NYSE and down 4% on the Nasdaq compared to Monday, according to preliminary data.